Fire TV Gen 1 somehow softbricked ?

Hello

i have a strange problem here with the gen 1 FTV
First of all it was on 5.0.5 with disabled Autoupdating.
I just waited so long for a twrp and root but it somehow wont show up since month
last thing i did was to install APTOIDE andi think i installed an app like Amazon shop oder shop underground
after that i cant get into the system settings anymore. i can see it and for exaple if i go to TV settings it just get out to the startscreen of the fire tv
i did install settings apk bu i cant do something with it either. it just go to the start screen.
after i was pissed of i DID gave up on waiting for twrp and UPDATET ist to 5.0.51
but the problem is the same there also.
if i go to RECOVERY i cant do anything. I just get a red text " GO AMAZON COM " or like that.

So what i want to do is a FACTORY RESET. but i cant do it. maybe this can solve my problem.

the fire tv says " NO AMAZON SHOP APPLICATION IS INSTALLED "
somehow im FU :)
Cant do a factory reset in the normal Settingsscreen.... no go in recovery...

any ideas ?

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